Rotary core drill



2 Sheets-Sheet l O. DUDA ROTARY cRE DRILL Filed Nov. 1, 1923 nvvunvToR.

A TToRNEYS.

May 25, 1926'.

May 25, 1925 1,586,415

o. DUDA ROTARY CORE DRILL Filed Nov. 1, 1923 2 Sheets-Sheet 2 'Patented May Y25, 1926.

UNITEDqsTAfrEs oswann DUDA, or HOUSTON, Texas, assIGNon To REED nonnen nIT COMPANY, or

" noUsToN, Texas, A coaronaTroN or Texas BOTARY CQBE DRILL.

Application led November 1, 1923.' Serial No. 672,189.

The inventionis designed to form and extract from the ground a core which will show the character of the formation at the point under investigation and it consists in 5 the features and combination and arrangenient of vparts hereinafter described and particularly pointed out in the claims.

In the drawings: Fi re 1 is a vertical sectional view of a l core drill embodying theinvention.

Fig. 2 is a view of part of the core and associated parts.

Fig. 3 is a view of the removable section ofthe core tube.

Fig.' 4 is a sectional viewV .of' the cutter head. Fig. 5 is a bottom plan view ofFig. 4.

Fio'. 6 is a vertical sectional view of the member which carries the core trapping 20 devices. j

, Fig. 7 is a bottom plan view of Fig. 6.

Figs. 8 and 9 show a clamp for holding the parts of the core tube together.

Fig. is a vertical sectional view of the tube . adapted to screw f head, Fig. 11.

' Fig. 11 is a vertical sectional view of the lower member of the cutter head, carrying the cutters, *and adapted for connection with the upper member of this head, shown in Fig. 10.

, In these drawings 1 represents the outer casing of the core bit body, having screw 3 threaded thereto'at 2'the cutter head 3 carryiug cutters. The casing or tube 1 at its l upper end is screw threaded into a coupling into the other part of the 5 having `a screwfthread connection at 6.

with a coupling member 7 to which the drill stem is connected. A tube 8 is located within the barrel or casing 1 t-o receive the core which is cut from the bottom of the hole by lthe cutters 4. This core receiving tube `is made insectionsS, 8, Figs. 2 and 3, which 4 9. These c amps are made` u oftwo members 9, 9", the former of vv ich is a. split ring tapered and screw threaded exteriorly upper member of a two part cutter head,

are held to ether by clamps 9, Figs. 8 and` 10 screw threaded thereon, which cap: has; a stem 11, which is swivelled in a.V block .12,

the connection between these parts being formed by the collar or washer 13 and the nut 14. The knut vis screw threaded onto the up r reduced end of the stem 11' and the colar overlies a part of the block 12. The block 12 has a 4central bore 16 to vent the core tubeto the outside of the apparatus.

VPATlzNT oFFlcs.

assage or passages as at 15 for the down ow of iushing Water.y The stem 11 of the swivel connection hasa This central bore connects with a passage 17 extending laterally through block 12 and through a screw plug 18 threaded into' the coupling 5 and having its inner end seated lin a de ression in the side of the block .12. pug has a recess at 19 to receive a This wrenc Then in place'the plug-holds the block 12 against longitudinal displacement.

At the lower end of the core tube there is connected thereto by screw threads a member 20 in theform of a collar. vThis collar has a lain exterior surface and a plain -bevelle lower end. It is seated in the lower cutter head which may rotate around this collar. holding devices 21`which are intended to entrap the core when the latter has risen rela.- tively within the core tube.- These trapsor core retainers are pivotally mounted at22 within openings or recesses of the collar.

The cutter head at 23 isprovided with a coarse thread with which the threaded art of a plug 24 enga-ges. This plug initially closes the lower end of the core tube and the bore 25 through the cutter head leading The collar carries the traps orthereto, so that as the .apparatus is being lowered into lthe hole the core tube will be closed and therefore .will not receive' scrap-I against rotary movement equal to that of the i' apparatus,1 will. Aunscrew from connecton .with thecutterhead and .iny this lactionit will rise in. relation thereto and thus it will enter the core vtube and thus open the said tube .at its lower endrfor the relativeassage upwardly thereinto of the Core w ich 1s formed or leftstanding at the axial'center of the hole bein cut, and this core will now,

' same;

relatively, -risefinto the core';.tub e to ll the Any flushing water'. or fluid mud which may have entered the upper part of the core tube willbe .expelled through vent 16, 17 as the core fills. the core tube. The

4 plug or-closure 24 is hollow and it has an upward hollow extension or sleeve portion 24 which, when the plugis in normal position,

` as shown in Fig. 1, will lhold back the detents or retainers 21 and this posltion of the retainers will ersist until the plug or closure rises to a evel'above the upper ends of the retainers, whereupon they will engage the core. f y

When the desired length of core hasbeen cut and has been received in the vcore tube,

v may be formed in two pieces, as shown inv the apparatus is withdrawn from the well. The retainers 21 will engage the core, as )ust stated, and 'upon removal of the apparatus from the well-or hole the core will come with it, beinv now lodged in the core tube and retained by the traps or holders 24.

vThe cutters 4 are held in place by bolts 4* and by cross pins- 4" extending across the recesses 1n which the cutters are located, and through notchesin the cutters.

' These cutters have outer and inner cuttin Figs. 10 and 11, in which the upper part 3a screws into the lower part 3b, the threads being coarse, as at 3,and a shoulder joint being provided at 3d, to enable breaking out yat this point without danger of stripping threads, such as has occurred when line l ,f threads have been used.

To remove the core tube with its contained core of material from the apparatus,` the connection .at 6, 7 is broken, screw plug 18 is screwed back and the core tube is removed by pulling onthe loop 27, the base portion of which is screw threaded onto the block 12. When the tube is removed access to the core 'can be gained. by separating the two parts ft8and8". 'i'.

`By'reason'of theswivel connection at the 4upperend ofthel coretube and the fit of the collar 20 relative'to the head, the core'tube' will remain relatively stationary while the core-.bit and the stem 1 rotate around it. This Will" prevent the core, .fronr dbeing twisted oitanddestroyed,l With my f substantially rectangular or square cross sectional shape. This provides clearance for the upflow of flushing water and detritus.

Flushing 'water will pass down through the space between the core tube and the casing or stem 1,.thence through the passages 2 8 to the cutters, and thence 'up between the outer side of the apparatus and the wall of the well.

The extension 26 may terminate in the form of a fish tail bit to cut its way into the bottom of the hole.

lt will be noticed from an inspection of these conduits, through the spaces 29 which are defined on their inner sides by the walls 30 extending down and acting as shields against the impinging of the water upon the central core of the material. The recesses or spaces 29 are open laterally at 31 for the outward or lateral flow of the Water or Hushing mud after this leaves the lower outlets of the assages 28 and this lateral flow of the iushing water is along the side face of the cutter and directly to the cutting edge thereof, keeping the latter cool. From this constructionv it will be seen that the core of material is protected from any action thereagainst'by the lushin waten The collar 20 virtualy seals the lower en d of the tube from the lushin water and it forms substantially an extension of the core tube. It remains stationary therewith and:l

carries the traps or core retainers so that these alsov remain stationary.

I claim:

l. In combination in a core drill, a hollow head carrying cutters, a hollow drill stem carrying the ead, acore receiving tube within the drill stem, a swivel support for the upper end ofthe core tube, a collar fixed l p on the lower end of the core tube, and' having 4'relative rotative contactwith the wall y I of the head and forming a seal for'the lower end of the tube against the access of flushingwater, conduits through the head for the` flushingwater, core retainers pivoted to said' collar anda plug'screwed into the head and having'an extension projecting up into thecollar and holding the retainers initially in c zonstruci.',IlA if ,",eoiel retracted positiomsubstantially as described..

tube withnfthe' drill pipe,

'.lth'e drill een@ ai a oouplu f2. In'combination, a' drillblt having cut-V ters anda centralbore, a.drill pipe, a core4 for ipe, a .block 'removably attached,

the aeual'gS-Wel www w tion between the Vcore tube `and said block, comprising a hollow stem having a lateral port, said 'block and coupling having aligned ports and a hollow screw for holdin the block in lace, substantially as describe and a pul ing device connected with the block by which the core tube can be with-- drawn from the drill pipe, substantially as described. i

3. In combination, a drill bit having substantially radial slots, cutter blades mounted in said slots and having outer and inner cutting edges, screw bolts passing through the cutter blades and into the drill bit body, said cutters having notches at their upper edges, and pins passing through said notches and into the body of the bit, substantially as described.

4. In combination in a core drill, a cutter head, a sectional casing connected thereto to rotate the head, a core tube Within the casing, a cou lin between the sections of the casing, a loc removably seated in the coupling, detachable means for holding the block in place on its seat in the coupling, a stein connected with the upper end of the core tube swivelled in the block, and means attached tov the block for engagement by hoisting means, substantiall as described.

In 'testimony whereof, I a x my signature.

OSVVALD DUDA. 

